Why do adults need less milk than babies do?

Adults need less milk than babies because their nutritional requirements shift as they grow. Infants rely on milk for most of their calories and nutrients, as it provides essential proteins, fats, vitamins, and minerals for growth and development. As individuals mature, they can obtain these nutrients from a more varied diet, including solid foods, which reduces their reliance on milk. Additionally, the digestive system of adults is adapted to process a wider range of foods, making excessive milk consumption less necessary.